From af4ccae4b704ee333e199ca27542be0ed040b269 Mon Sep 17 00:00:00 2001 From: YueHaibing Date: Sat, 3 Dec 2022 17:46:35 +0800 Subject: [PATCH] tipc: Fix potential OOB in tipc_link_proto_rcv() [ Upstream commit 743117a997bbd4840e827295c07e59bcd7f7caa3 ] Fix the potential risk of OOB if skb_linearize() fails in tipc_link_proto_rcv(). Fixes: 5cbb28a4bf65 ("tipc: linearize arriving NAME_DISTR and LINK_PROTO buffers") Signed-off-by: YueHaibing Link: https://lore.kernel.org/r/20221203094635.29024-1-yuehaibing@huawei.com Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- net/tipc/link.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/net/tipc/link.c b/net/tipc/link.c index 115a4a7..8fdd3b2 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -2223,7 +2223,9 @@ static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, if (tipc_own_addr(l->net) > msg_prevnode(hdr)) l->net_plane = msg_net_plane(hdr); - skb_linearize(skb); + if (skb_linearize(skb)) + goto exit; + hdr = buf_msg(skb); data = msg_data(hdr); -- 2.7.4